Hoe



G. M. HARRY HOE Filed Oct. 1, 1928 3 Sheets-Sheet l JNVENTOR; W7 Y 7 \I'lllllll'llill lllllll MMM . ATTORNEYS.

y6,1930. G. M. HARRY 1,757,572

HOE

Filed Oct. 1, 1928 3 Sheets-Sheet 2 I N VEN TOR.

/ ATTORNEYS.

' "May 6, 1930.

G. M. HARRY HOE - Filed Oct'. 1, 1928 3 Sheets-Sheet 3 1 I NVENTOR.

/ A TTORNEYS.

Patented May 6, 1930 UNIT D S A-res GEOFFRE -M, HARRY, or minwnuxnn, vrrsoon srtr flnssrenon ronannrsonrnenn t CORPORATION, or MILWAUKEE, W scons n, 1A tqonronarron "orwrsconsm V Application fiiea octobrji, 192s} serial'fno. 5,309514? Such excavating machines are widely used and although a number of different types I are employed they all embody practically the same essential featuresand difi'eronly in details of construction. In general such power shovels comprise a revolvable plat- "form mounted on a tractor orsuitable running gear a swlngable :b-oom mounted on the platform for up and down' moveinentya dipper stick pivoted "to :the boom and extending above and below theaboorn; an excavatlng bucket or dipper carried' by the lower end of the stick; a hoistingdrum mounted .on the platform and controlling a hoisting line'connected to the upper end of the dipper stick;

and a digging drum mounted on the plats form andcontrolling 'a'digging line when:

' ing line connected to the bucket and conse quently to the lower end of the idlpper 'stleln The hoisting line and the diggingrl ine constitute the *sole means providedrztor controlling the raising'an d lowering of the boom and the angular positiongof the dipperjstick the hoisting drum and ifan'y slack occurs in relative to the boom. ltis'essential with all theseconstructions to oppose the lt'orces exert ed through the hoisting line and the digging line in order to control the'position of'the 7 1000111 and swing the dipper stick for digging; Thus, whenholstlng the b-OOIIllt 1S necessary to maintain a tension on the digglngline while the hoisting lineis'ibeing pulledin by the digging line (andflthisnot infrequently occurs due to the slipping on the'brake-cons trolling thetoperation of the digging idrum) 1 the dipper stick and its-bucket swing out wardly with a-ierkand 131161300111 drops until the slack inwthe-diggingline "is-taken up Moreover," with these old types of construc- 1 th n, when digging line pul d at swing" the excavating ancl dipper stick for digging, lthe lboom is necessarily lifted up somewhat- Thisise'unavoidable but itiis undesirable to have the angular-position of the, boom always disturbed :duringa digging operation. 'lfhen again, :in clumping the -.excavating bucketsjof these prior -:c0n-v structions .it is necessary '-to relieve the vtension on" the eligging'line. This resultsiin'the bucket and the "clipper 1 stick being :Eorcibly jerked xoutwardly and upwardly, :the *boom dropping. To checkthis, thejdigging line mustabe put under ftension'again. Thisopenations'ubjects all of the parts to ,zSBVBIBiELIld sudden shocks and'strains. audit is .clangerous asit is liable to snaptheacontrolljngcables 'or to cause :a collapse .ortfailing in the hoisting tackle in which event the boom and dipperdrop to the ground with destructive force. ldloreover, because of atheiine'cessity :of opposing the 'forceof the rhoisting line to that "of the :diggingline, itis necessary to use a :booster drum to increasextheidigging force and the digging lineispeedis-practioal- -1y cut inthalf. I f

'One otthe, principal obj ects of the present invention istoiprovide an excavating :m-a-

type which ,ayoidsithese difficulties and -;dis-

advantages andwhich providesifor the .yin-

dependent control and actuation of the'boom --chine'ofathe backactingrshoyel-zor powerthoe and dipper istick 'lwhile permitting Qof 1a sinooth'iand easy E raising or a lowering of the V boom and a smooth -andspeedy' though forcible actuationtof the dipper-"stick The raising and' -lowering ofthe :boom' and the-swinging of the dipper stick are entirely indepenol ent each of the other. In this way the 1 dipper stick may. bB'SaCOUIIELtQlY located. or spotted in anyQposi tion throughout its entire range of movements without ,anyjmoirement of i the aboorn'fand with-a smooth. or easy auction on the part of the idipper stick. LFurther, the

a dipperstickmay be positioned to dump the excavating bucketjwithout erking .and

maintain the boom in proper position and as lo a consequence the digging line speed is-doustrains on any elementsvof themachine, and the boommay be raised and lowered without disturbing theangular relation of the dipper stick thereto.' The full force applied to the digging line is eifective'to impart dig-- .ging movement to the excavating ,bucket without opposition by theforce utilized'to bled over the speed now available andino booster drums orsimilar mechanism are re-- quired to augment the drive imparted through the digging line. "Finally all; of

the operating'lines employed are maintained phases of the operation. r

the excavating machine proposes the usual revolvable platform mounted on a tractor or suitablerunning gear; 'Avswingable boom .18

- mounted. on the platform in the usual manner .for up and "down movement. -To the outer end of the boom a dipper stick is piv oted and extendsxabove and below'the same,

the-lower end yofzthe' dipper stick carrying an excavatingbucket or dipper. facing clownwardly toward the groundlin the extended position of the' dipper stick and toward the to. is'controlled by a dipper'stick hoist drum machine when the lower end of the dipper stick isswung toward the machine. So far, the construction of the .standard machine is not'varied in any essential. manner. However, in lieu of supporting? and controlling I boththeboom'and the dipper. stick by two lines, the present invention proposes theprovision of three lines orcables. More particularly, the present invention proposes alboom hoisting line extending from the boom hoisting'drumon the platform over a pulley on the usual A-frame to the outer end'of the boom, the boom hoisting line'being directly connected to the boom and not intermediately'connected therewith through the dipper stick. The dipper. stick is controlled by means of a digging line connected to the excavating bucket :in the usual manner. and controlled from the digging." drum. For swingingthe dipper'stick outwardly and upwardly a dipper hoisting line is provided and which may be driven by "suitable gearing from the digging drum. The dipp'erhoisting line hasassociated therewithmeans formaintaming a constant and uniform tension thereon in any position of the dipper stick and boom;

andadva-ntages reside in cerwill be hereinafter more fully I described and particularly pointed .out in the appended claims, reference being had to the accompanying drawings forming a part of ithis specifi cation,-and in which: l V I i In accordance with the present invention" Figure 2 is a fragmentary plan view illus-- V trating the digging and hoisting drums and elevation further illustrating the reeving of the dipper hoisting line and their association with the boom and .dlpper Figure 5 is a detail view showingthe as i y at t axis f, i g of the bocm'in u mly taut and tensioned throughout all invention, this revolving platform "being mounted on the usual tractor or running gear such as indicated at-2. .As is conventional in the art and industry, mechanism for driving the machine and for swinging the platform are mounted on the-platform 1. All of this is wellknown and needs no detailed description here. The various. mechanism provided on the revolvingplatform of a machine of this character is well exemplified in the patent to Arthur G. Henricks No.

ticularly to Figure 1, the numeral 1 desig- 'natesgenerally a revolving platform of an excavating machine embodying the present 1,570,061, grantedJanuary 19, 1926, for hoisting mechanism for excavating cranes, and

also in the patent to Louis lVehner, No.-

1,5 70,108, granted January '19, 1926, for excavator crane. r 2

Atthe forward end of the platform 1,the

so-ca'lled A-fr-ame 3-is mounted and is suit- 'ably supported and held in -position on the V V revolvingplatform. ,A boom-.4: has its lower end pivotally mounted on the revolvable platform so as tov be capable of swinging up and downin a vertical plane.- As illustrated in Figures 2and3, this pivotal mounting may be effected by utilizing a heavy casting or bracket 5 suitably secured to the revolvable platform and havingbifurcated arms 6 sup- 'portinga' fixed pivot. shaft 7. Pivot plates 8 are riveted to the elements of the boom' & and have pivot openings'which receive the shaft 7. Any suitable pivotal mounting may 1 be provided in lieu of the one shown for the sake of illustration.

To the other end of the boom 4, a dipper stick 10 is pivotally con5} nected asfla t 11, so that the dipper stick ex tends' above and belowj the boom. An excavating bucket or dipper 12 is carried by the lowerend of the dipper stick Vin-the usual manner. v

The-boom this held in adjusted position'by means of a boom hoistline '15 having direct connection with the boom- 1, that is, a connection that is independent of the dipper Stick 10. Inthe' present" embodiment of" the invention this raised and lowered and is connection between the boom hoist line 15 and boom 4 is shown as consisting of "a bail 16 fastened to the line l5and pivotally connected to the boom by means of the proecting portions of the pivot 11, these project ing portions of pivotll being fitted in bear 'ing pp'enings provided in the bail. Intermediate ts ends the boomhoisting line is trained over a guide sheave 17' mounted on The dipper stick is actuated and controlled means ofa'uiggin line 20 anda dipper shaft 7 and driven by chain and sprocket hoisting lineldesignated generally at 21. .7 The digging line 20 .is Connected by bailorchains 1 22 with the excavating bucket'1-2fand'conse- Quently is connected with the lowerend of the dipper stick 10 to which this bucket 12 is fastened; This digging line 20'extends rearwardly and upwardly to the usualdigging drum 23 mounted on the platform and controlled and driven 'inthe usual manner; Intermediate its ends the digging line 20 passes, between and partially around guide sheaves designated at 24 and 25, th'e guide sheave 24' being mounted on theshaft 7 and the guide sheave 25 being mounted on a shaft 26; also utilizedfto supportthe A-itranie. The dipper stick hoist line '21ha's one end dead-ended as at 30 on the shaft 7 and from the anchored a endf30 ,a run 31 extendsiorwardly to a pulley rotatably mounted at the lower end of a 'tensionin'g Tor equalizing frame "33 made up of a pair of arms or plates pivotally indicated at 34. After-passingaround the Ipulley 32 the dipper hoisting lin'e'21 is formed witharun 35 which extends back to a dipper hoisting drum 36 rotatably mounted on the gearing 37 from the digging drum 32.- .A

iew turns 'ofthe idip'per hoist line 21 are wrapped around the "drum 36 and beyond those turns the line 21 is formed with a; run

38 extending'up along the booman'd over a pulley 39 rotatably mounted. on the shaft 34- or axis of swin of thetensioningor equaliz 7 in}; arms 33:Zfter passingrover thepulley 39 the line 21 is formed with a run 40flwhich extendsdown around and over a pul1ey'41' "also mounted atthe lower end of the equaliz ing arm 40 and beyond the pulley 41 the dipper hoist li'ne is formed with a run 43 ex'-' by the chain and sprocket gear 37 from the digging drum so" that I this dipperhoist drum is rotated in'a clockwise :directionas "viewed A V e f uniform diameter. supported at their upper ends on the boom as in Figure 4 and 'th'eturns ofthe dipper hoist line onthis drum are sodriven as topull in onthe run'35 and pay out on the run 3 8.

This swings the tensioning or equalizing arm I in' a clockwise direction as viewed in Figure 4 and draws it up toward the boom 4 and eventually into substantial 'alinement, .with p the boom. As a result of thisaction the runs 31 and .35 are shortened considerably and i the cable thus made available'permits the run 43 to. lengthen to the extent necessary to accommodate the' out-ward throw of the upper end of the dipper stick 10. .When "the digging sequently the ,upper end jotthefdipper stick is pulled inwardly and the lowerend'of the dipper stickofthe, excavating bucket 12 swings outwardly. 7 During this}. action the equalizing or tensioningar'm is swung in a counter-clockwise direction and maintains the runs 31 and '35 taut as theyarelengthened, In otherwords, annifOrm and even tension is maintained on the entire dipper stick hoist line in all phases o ftheoper'ation. 3

In Figure 4,.the axes ofipulleys 32 and are on the same axis and thedrumf isgt 'r With this construction the boom may be raised .and lowered without disturbing the angular relation of the dipper stick 10 and in factraising and lowering of 'theboomis entirely independent of the dipper 'stickfor of; the control arms for th'e dipper stick.

Similarly, the dipper stick lOmay be swung relative to theboom without disturbing "the supportof the boomas the'mean's'for swinging the dipper stickis entirely independent oi" the means for supporting the boom. The ==r 1smg and lowering ofthe boom and the control of thefdipper stick is so positiveand certain that all of the motions essential to the operation of the machine and of which its these parts are capable are effected smoothly .and easily and with maximum speed and power. When the digging drum is drivento haulthe excavating bucket inwardly for dig-, .ging, the full force applied to the digging line20is effectively transmitted to the bucket A v12 as there is no force" opposingthe' swing of the bucket exceptthe weight of the parts,

the ordinary rrictional'resis'tance, and the resistance which the material presents to the egdipp r hoist line at "this "time is automatically paid digging action of the bucket.

V out to the proper extent as its drum 36 is driven fromthe digging drum at the proper speed, the chain and sprocketgearing 37 being constructed, and proportioned to synchronize properly the, drive of the drum 36 with the drive'of the digging drum 23. Similarly,von

the return movement of theexcavating bucket or when it is being swung up for dumping,

the dipper stickmaybefreely and speedily swung and accurately spotted'or stopped in' the pr'oper location as theboom is independ I, ently supported and as the digging line'is the path of travel of the dipper hoist line.

7 travel of the upper end of the dipper stickpaid out to a degree proportional to the haulingin of the dipper hoist line. i

From theforegoing it will be understood that the digging drum andthe dipperohoist drum, beingpositively geared to each other and being connected with the digging line anddipper hoistline'for reeling and unreeling thesame, provide means for movingthe lines in opposite' directions at a constant linear velocity ratio" whereby to impart. appropriate motion to the dipper stick. Thetensioning device, associatedwith the dipper hoist line, operates automatically to sovary as-tofeed thedi pper hoist'line at a slow instantaneous'speed at one end of the path of travel of. the upper-end of the dipper stick and at increasing instantaneous speeds throughout the remainder of the path of in one direction. This action isreversed when the dipper stick 1s swung 1n the opposite d1- rectlon-and as a result the lines are maintainedruniformly taut in all phases of the the machine when thedipper stick is swung" toward themachine, a boom hoisting drum mounted on the platform, a'boom' hoist line wound on the drum and directly connected with the boom for raising and lowering the boom and holding thesame in position, a dig ging drum mounted on the platform, a dig ging line wound on the digging drum and connected to the excavating bucket, a dipper hoist. drum driven fromthe digging, drum, -and a dipper hoist line actuated from the dipper hoist drum andlco'nnect'ed to the upper end of-the dipper stick,v I

, 2. A power hoes including a platform,a

j boom mounted on thejplatform for up and down movement, a dipper stick pivotally mounted on the boom for swinglngjmovement and projectingabove and below-the same,

an excavating bucket carried bythe dipper stick and facing downwardly, toward the ground when the dipper stick is extended and facing toward the machine when the dipper stick isextendedand facing towardthe ma-.

chine when the dipper stick is swung toward the machine, a boom hoisting drum mounted on the platform, a'boom hoistline wound on the drum and directly connected with the boom for raising and lowering the boom and holding the same in position, a di gging drum mounted on the platform, digging line woundon the digging drum'and connected to the excavating bucket, a dipper hoist drum driven from the digging drum, a dipper hoist line having one end anchored to the platform and having its other end connected to the upperend of the dipper stick, an intermediate portion of the dipperstick hoist line being wrappediaround said dipper hoist drum and driven thereby, and means co-acting with the dipper; hoist line for maintaininga uniform and even tension onthe same'in' all positions of the boom and dipper stick.

' '3. Alpower hoe including a platform, a

boom mounted on the platform for up and down movement, a dipper stick pivotally mounted on the boom for swinging movement and projecting above and below the same, an excavating bucket, carried by the dipper stick and facing downwardly toward the ground when the dipper stick is extended and facing'towardthemachine when the dipper stick is swung towardthe machine, a boom hoisting drum mounted on the platform, a

boom hoist line wound on the drumand di rectly connected withthe boom for raising and lowering the boom and holdingthe same in position, a digging drum mounted on' the platform, a digging line woundon the digging drumand connected to the vexcavating bucket,a dipperchoist drum drivenfrom the digging drum,'a dipperhoist line'having' one end anchored to the platform and having its other end. connected to the upper end of the dipper stick, an intermediate portion of the dipper hoist linebeing wrapped around said dipper hoist drum and driven thereby, means co-acting with the dipper hoistline formaintaining a uniform and even tension on the same mall-positions ofthe boom'and dipper.

stick, and comprising a-tensioning arm having one end pivoted to the boom andjproit vided w ith guide pulleys at its pivoted-end andat'its free end, the dipper hoist line having a runextending from its anchored endto a pulley located at thefree end of the-tensioning arm, a runextendin'g from said last mene P 1 37 the dipper stick hoistdrum, a n x din ll the dipper hoist drum to a pulleylocatedat tlieuaxis'of swing of the tensioning' arm, a run extending from said last mentioned pulley'to a pulley located at the free end 'of saidtensionin'g arm and a new? im. ext nding f om. s i la t ment eeee pul eytethe ope-ren of edipPer'sti -f for up en down. movemen h isti g. ere nism for raising and lowering the boom and ld g it n; adjus P ion, a p r t i k pivotally, supported on the outer endofthe boom and extending abfoveand below the same, an excavating bucketicarried by the lower end of the" dipper stickand facing downwardly toward-the ground inthe extendedposition of thedipper stick andto: ward the machinewhen the dipper stick is swung inwardly, a digging line connectedv to the excavating bucket, a dipper; hoisting line connected to the upper end of the dipper stick, and means carried by the boom and, co-operable with the dipper hoist 'line for maintaining a uniform tension thereon in all positions of the dipper stick. 1

5. A power hoe including a boom mounted for up and downmovement, a dipper stick mounted on the boom for swinging movement, an excavating bucket carried by the dipper stick, hoisting means forraising and lowering the boom and supporting itin adjusted position, means independent of'said hoisting means for swinging the dipper stick and including a digging line connected to the excavating bucket, a dipper hoist line connected to the upper end of the dipper stick, a drum for driving the dipper hoist line, and an equalizing device swingably mounted on the boom and having pulleys at its pivoted and at its ,free ends around which the dipper hoist line is reeved.

6. A power hoe including a platform, a boom mounted on the platform for up and down movement, hoisting mechanism for the I boom, a dipper stick swingably supported by the boom, an excavating bucket carried by the dipper stick, a digging drum mounted on the platform, a digging line actuated from the digging drum and connected to the excavat ing bucket, a dipper hoist line connected to the upper end of the dipper stick, a dipper hoist drum mounted atthe axis of the boom foot and from which the dipper hoist line is driven, gearing for driving the dipperhoist drum from the digging drum, and means carried by the boom and co-operable with the dipper hoist line for automatically maintaining the same uniformly taut in all phases of the operation.

7. A power hoe including a platform, aboom mounted on theplatform for up and: down movement, hoisting means for the boom, a dipper stick swingably supported by the boom, an excavating bucket carried by the dipper stick, a digging drum mounted on the platform, a digging line actuated from the digging drum and connected to the excavating bucket, a dipper hoist line connected to the upper end of the dipper stick, a dipper hoist drum mounted at the axis of the boom eiwithitl eiii ii hb St Ii ieFtQrE the Same ean ii all t Z- i er describ d a digging-"line and adipper oist' en 'hoisties tat letditth b from the dipper stick at a slow'instantan'e assess d e en en t p th ef l afil excavatingibu cket carried by the dipper boom,

tee; nd. t eml hich .6 p er heist e s dri en aries f r driving th is l-h st rum h d g in rum; n wag n detie tiv lly' uppo dml t o m, a d having pulleys 'atits "pivoted and free ends,

said dipper hoist line? be ngreeved around r aid pu l n he in ledie t b e el s d ie l iiia i liid i meve eiit dippefis ik moun ed 9 1 1 oo or? ng j' gi met x e t an exca atin u etet h hjq type car d by he dipper StiQks- QP EW q i v fi lli t h han, a d n Heated dippe -heist lin e einected wi h th a psif j.f@. ::swiee ne th ame' ndep a y 80, ofthehbist e' a kle01the b as rdr' sized dlr e e hediPPer-hoistlie a d h in l i and ei s e ng d i 0- 1;;

ie idine a be 1 mount d p d ddwe moment pii. e e iltz ed on. thgebeem fe wm "e '4 ex avating bu ke ema itL JmPsMt h me-W I f h b v 1inch"; ted w t e d ppe 'eti l fe v gin'" hesame' ependent y e the lieistiile t i k f h b em, means forapprep a i '1 ng h ig ng ine and the din ine, 1, 1 e' en win sie ie ma ens t in p edetermined p t n s un s; ts ui in m ans. me t n wit 'th -P hoi t ne or maintainin "the samepx tr'm ty g nstant neous speed thron th lid l efth Path f travel of the dippgi stick. .7 120 11?. excavating mach-ineof the "charac terdescribed including a'boom m-o lintedl fgr up and o m f mest a dipp r sti k d n d 1 t e b m .fQ' win ing mq emestae epa a ehe ie k e er he boom, 1 eligei e ine an dipp r hoist ite b inl t d with the dipper stick for swinging the same in epeasl itly of th'h ie i tekle for e e siljm itits y a ed t eee ate I nected with the'dipper stick for swinging the same independently of the hoisting tackle for the boom, driving means for moving said lines in opposite directions at a constant linear velocity ratio to' impart motion'to. the dipper stick, and tensioning means associated with and actuated by the dipper hoist line for, maintaining both lines. uniformly taut throughout themotion of the dipper stick.

13. An exacavating machineof the character described including a boom mounted for a up and down movement, a dipper stick mount ed on the boom for swinging movement, an excavating bucket carried by the dipper stick, separate hoisting tackle for the boom, a dig same independently of the hoisting tackle V the boom, means for 'appropriatelydriving the digging line andflthe dipper hoist line, andgashiftable tensioning device supported for movement .ina predetermined pathlandshiftable in response to variations in the an: gularity of the boom and dipper stick'and co-operable with one of said lines to maintain the same uniformly taut in all phases of the operation. V i y In witness whereof, I hereto aflix my signature.- V v GEOFFREY M. HARRY.

ging line and-a dipper hoist, line connected with the dipper stick for swinging the same independently of the hoisting tackle for the boom, driving means for moving said lines in opposite directions at a constant linear velocity ratio to im art motion tothe dipper stick, and positive y actuated means associated with one of the lines for varying the amount of the line fed to the dipper stick in'such a manner asto maintain both lines taut throughout the movement of the dip per stick.

14. Anexacavating machine of the character described including ajboom mounted for up and down movement, a dipper stick mounted on t-he boom for swinging movement, an excavating bucket carried by the dipper stick, separate hoisting tackle for the boom, a dig ging line and a 'dipper'h oist line connected with the dipper stick for 'swingingrthesame v 7 means responsivein its action to the anindependently of the hoisting tackle for the boom, a power drive for said lines, and

gularity of the'boom and dipper stick and associated withone of the lines for varying i the amount of the line fed tothe dipper stick in such manner as to maintain both lines aut throughout the movement of the dipper stick. y i 15, An excavating machine of the characi terdescribed including aboom mounted for up and down movement, a dipper stick mounted on the boom for swinging movement, an

excavating bucket carried by the dipper stick, 7

separate hoisting tackle for the boom, a digging line 'and a dipper hoist line con; nected with the dipper stick'forswinging the 

